Independent games developer Chris Mayer has announced the release of Brain App for Mac. The Mac version features all of the Brain Exercises from ‘Brain App XL’, the enhanced iPad edition of the game. A new user interface has been created specifically for the Mac platform. Over 19,500 iPhone, iPod touch and iPad users in more than 50 countries have given their brains a work-out with Brain App. Using tried and tested techniques, Brain App presents a variety of rapid-fire math problems in quick succession to exercise the brain. In it’s first couple of days on sale, Brain App for Mac has quickly risen to become #1 of the "Educational…